#pragma once
/*
-----------------------------------------------------------------------------
This source file is part of OGRE
(Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org/

Copyright (c) 2000-2009 Torus Knot Software Ltd

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
-----------------------------------------------------------------------------
*/

#include "Vector3.h"

/** \addtogroup Core
*  @{
*/
/** \addtogroup Math
*  @{
*/
/** 4-dimensional homogeneous vector.
*/
class Vector4
{
public:
	float x, y, z, w;

public:
	inline Vector4():x(0), y(0), z(0), w(0)
	{
	}

	inline Vector4( const float fX, const float fY, const float fZ, const float fW )
		: x( fX ), y( fY ), z( fZ ), w( fW)
	{
	}

	inline explicit Vector4( const float afCoordinate[4] )
		: x( afCoordinate[0] ),
		y( afCoordinate[1] ),
		z( afCoordinate[2] ),
		w( afCoordinate[3] )
	{
	}

	inline explicit Vector4( const int afCoordinate[4] )
	{
		x = (float)afCoordinate[0];
		y = (float)afCoordinate[1];
		z = (float)afCoordinate[2];
		w = (float)afCoordinate[3];
	}

	inline explicit Vector4( float* const r )
		: x( r[0] ), y( r[1] ), z( r[2] ), w( r[3] )
	{
	}

	inline explicit Vector4( const float scaler )
		: x( scaler )
		, y( scaler )
		, z( scaler )
		, w( scaler )
	{
	}

	inline explicit Vector4(const Vector3& rhs)
		: x(rhs.x), y(rhs.y), z(rhs.z), w(1.0f)
	{
	}

	/** Exchange the contents of this vector with another. 
	*/
	inline void swap(Vector4& other)
	{
		std::swap(x, other.x);
		std::swap(y, other.y);
		std::swap(z, other.z);
		std::swap(w, other.w);
	}

	inline float operator [] ( const size_t i ) const
	{
		assert( i < 4 );

		return *(&x+i);
	}

	inline float& operator [] ( const size_t i )
	{
		assert( i < 4 );

		return *(&x+i);
	}

	/// Pointer accessor for direct copying
	inline float* ptr()
	{
		return &x;
	}
	/// Pointer accessor for direct copying
	inline const float* ptr() const
	{
		return &x;
	}

	/** Assigns the value of the other vector.
	@param
	rkVector The other vector
	*/
	inline Vector4& operator = ( const Vector4& rkVector )
	{
		x = rkVector.x;
		y = rkVector.y;
		z = rkVector.z;
		w = rkVector.w;

		return *this;
	}

	inline Vector4& operator = ( const float fScalar)
	{
		x = fScalar;
		y = fScalar;
		z = fScalar;
		w = fScalar;
		return *this;
	}

	inline bool operator == ( const Vector4& rkVector ) const
	{
		return ( x == rkVector.x &&
			y == rkVector.y &&
			z == rkVector.z &&
			w == rkVector.w );
	}

	inline bool operator != ( const Vector4& rkVector ) const
	{
		return ( x != rkVector.x ||
			y != rkVector.y ||
			z != rkVector.z ||
			w != rkVector.w );
	}

	inline Vector4& operator = (const Vector3& rhs)
	{
		x = rhs.x;
		y = rhs.y;
		z = rhs.z;
		w = 1.0f;
		return *this;
	}

	// arithmetic operations
	inline Vector4 operator + ( const Vector4& rkVector ) const
	{
		return Vector4(
			x + rkVector.x,
			y + rkVector.y,
			z + rkVector.z,
			w + rkVector.w);
	}

	inline Vector4 operator - ( const Vector4& rkVector ) const
	{
		return Vector4(
			x - rkVector.x,
			y - rkVector.y,
			z - rkVector.z,
			w - rkVector.w);
	}

	inline Vector4 operator * ( const float fScalar ) const
	{
		return Vector4(
			x * fScalar,
			y * fScalar,
			z * fScalar,
			w * fScalar);
	}

	inline Vector4 operator * ( const Vector4& rhs) const
	{
		return Vector4(
			rhs.x * x,
			rhs.y * y,
			rhs.z * z,
			rhs.w * w);
	}

	inline Vector4 operator / ( const float fScalar ) const
	{
		assert( fScalar != 0.0 );

		float fInv = 1.0f / fScalar;

		return Vector4(
			x * fInv,
			y * fInv,
			z * fInv,
			w * fInv);
	}

	inline Vector4 operator / ( const Vector4& rhs) const
	{
		return Vector4(
			x / rhs.x,
			y / rhs.y,
			z / rhs.z,
			w / rhs.w);
	}

	inline const Vector4& operator + () const
	{
		return *this;
	}

	inline Vector4 operator - () const
	{
		return Vector4(-x, -y, -z, -w);
	}

	inline friend Vector4 operator * ( const float fScalar, const Vector4& rkVector )
	{
		return Vector4(
			fScalar * rkVector.x,
			fScalar * rkVector.y,
			fScalar * rkVector.z,
			fScalar * rkVector.w);
	}

	inline friend Vector4 operator / ( const float fScalar, const Vector4& rkVector )
	{
		return Vector4(
			fScalar / rkVector.x,
			fScalar / rkVector.y,
			fScalar / rkVector.z,
			fScalar / rkVector.w);
	}

	inline friend Vector4 operator + (const Vector4& lhs, const float rhs)
	{
		return Vector4(
			lhs.x + rhs,
			lhs.y + rhs,
			lhs.z + rhs,
			lhs.w + rhs);
	}

	inline friend Vector4 operator + (const float lhs, const Vector4& rhs)
	{
		return Vector4(
			lhs + rhs.x,
			lhs + rhs.y,
			lhs + rhs.z,
			lhs + rhs.w);
	}

	inline friend Vector4 operator - (const Vector4& lhs, float rhs)
	{
		return Vector4(
			lhs.x - rhs,
			lhs.y - rhs,
			lhs.z - rhs,
			lhs.w - rhs);
	}

	inline friend Vector4 operator - (const float lhs, const Vector4& rhs)
	{
		return Vector4(
			lhs - rhs.x,
			lhs - rhs.y,
			lhs - rhs.z,
			lhs - rhs.w);
	}

	// arithmetic updates
	inline Vector4& operator += ( const Vector4& rkVector )
	{
		x += rkVector.x;
		y += rkVector.y;
		z += rkVector.z;
		w += rkVector.w;

		return *this;
	}

	inline Vector4& operator -= ( const Vector4& rkVector )
	{
		x -= rkVector.x;
		y -= rkVector.y;
		z -= rkVector.z;
		w -= rkVector.w;

		return *this;
	}

	inline Vector4& operator *= ( const float fScalar )
	{
		x *= fScalar;
		y *= fScalar;
		z *= fScalar;
		w *= fScalar;
		return *this;
	}

	inline Vector4& operator += ( const float fScalar )
	{
		x += fScalar;
		y += fScalar;
		z += fScalar;
		w += fScalar;
		return *this;
	}

	inline Vector4& operator -= ( const float fScalar )
	{
		x -= fScalar;
		y -= fScalar;
		z -= fScalar;
		w -= fScalar;
		return *this;
	}

	inline Vector4& operator *= ( const Vector4& rkVector )
	{
		x *= rkVector.x;
		y *= rkVector.y;
		z *= rkVector.z;
		w *= rkVector.w;

		return *this;
	}

	inline Vector4& operator /= ( const float fScalar )
	{
		assert( fScalar != 0.0 );

		float fInv = 1.0f / fScalar;

		x *= fInv;
		y *= fInv;
		z *= fInv;
		w *= fInv;

		return *this;
	}

	inline Vector4& operator /= ( const Vector4& rkVector )
	{
		x /= rkVector.x;
		y /= rkVector.y;
		z /= rkVector.z;
		w /= rkVector.w;

		return *this;
	}

	/** Calculates the dot (scalar) product of this vector with another.
	@param
	vec Vector with which to calculate the dot product (together
	with this one).
	@returns
	A float representing the dot product value.
	*/
	inline float dotProduct(const Vector4& vec) const
	{
		return x * vec.x + y * vec.y + z * vec.z + w * vec.w;
	}
	/// Check whether this vector contains valid values
	inline bool isNaN() const
	{
		return _isnan(x) || _isnan(y) || _isnan(z) || _isnan(w);
	}
	/** Function for writing to a stream.
	*/
	inline friend std::ostream& operator <<
		( std::ostream& o, const Vector4& v )
	{
		o << "Vector4(" << v.x << ", " << v.y << ", " << v.z << ", " << v.w << ")";
		return o;
	}
	// special
	static const Vector4 ZERO;
};
